Opt Lett. 2018 Jun 15;43(12):2772-2775. doi: 10.1364/OL.43.002772.
We propose and theoretically investigate a dispersion-engineered SiN microring resonator, based on a cross section containing a partially-etched trench, that supports phase-locked, two-color soliton microcomb states. These soliton states consist of a single circulating intracavity pulse with a modulated envelope that sits on a continuous wave background. Such temporal waveforms produce a frequency comb whose spectrum is spread over two widely-spaced spectral windows, each exhibiting a squared hyperbolic secant envelope, with the two windows phase-locked to each other via Cherenkov radiation. The first spectral window is centered near the 1550 nm pump, while the second spectral window is tailored based on straightforward geometric control, and can be centered as short as 750 nm and as long as 3000 nm. We numerically analyze the robustness of the design to parameter variation, and consider its implications to self-referencing and visible wavelength comb generation.
我们提出并从理论上研究了一种基于含有部分刻蚀沟槽的横截面的、具有色散工程设计的氮化硅（SiN）微环谐振器，该微环谐振器支持锁定的双色孤子微梳状状态。这些孤子状态由一个带有调制包络的单个循环腔内脉冲组成，该脉冲位于连续波背景上。这种时间波形产生了一个频率梳，其频谱分布在两个间隔较远的光谱窗口中，每个窗口都呈现出平方双曲正割包络，两个窗口通过切伦科夫辐射相互锁定。第一个光谱窗口位于 1550nm 泵浦附近，而第二个光谱窗口则基于简单的几何控制进行调整，可以被调谐到最短 750nm 和最长 3000nm。我们对设计的参数变化的稳健性进行了数值分析，并考虑了其对自参考和可见波长梳状产生的影响。
